System Startup and Shutdown
Understanding the Boot Sequence
The Grand Unified Boot Loader
GRUB Configuration File
Emergency Boot Media
The init Process
SysVinit Startup
Upstart
Using systemd
Configuration Files in /etc/sysconfig
Shutting down/Rebooting the System
User and Group Account Management
User accounts
Management
Passwords
Groups
Pluggable Authentication Modules (PAM)
Authentication Process
Configuring PAM
LDAP authentication
File ownership